^ ^ "In the two hose structure the exchanged air will not come from the inside of your home or household, but enters in the second hose". Experts123.com. Retrieved 10 June 2015. Its exclusive element may be the presence of 1 major exterior device that connected to a number of https://drive.google.com/drive/folders/1DwQcVWGr5RtTFleX78g087Tcbb3eCLQO